feat: Add a config plugin for Expo 53 with CNG

[Off2Race]

Description

Added an Expo config plugin so that react-native-app-auth can be used in an Expo 53-based project using CNG (Continuous Native Generation).

NOTE: The plugin will detect the current Expo version and should work with versions prior to 53 but that use case is not well-tested. For best results, stick with Expo 53.

Thanks to @aurelian for the original version that led to this.

Steps to verify

STEP 1
Add the plugin to the app's app.config.ts. See example below.

import { ConfigContext, ExpoConfig } from '@expo/config';
import withAppAuth from 'react-native-app-auth/plugin';

require('ts-node/register');

export default ({ config }: ConfigContext): Partial<ExpoConfig> => {
	const existingPlugins = config.plugins ?? [];

	return {
		...config,

		plugins: [
			...existingPlugins,
			[
				withAppAuth,
				{
					ios: {
						urlScheme: 'my-url-scheme-goes-here',
					},
					android: {
						appAuthRedirectScheme: 'my-redirect-scheme-goes-here',
					},
				},
			],
		] as ExpoConfig['plugins'],
	};
};

STEP 2
You'll likely need to add a react-native-app-auth.d.ts to the folder where you keep your Typescript types:

declare module 'react-native-app-auth/plugin' {
	const withAppAuth: any;
	export default withAppAuth;
}

STEP 3
Run npx expo prebuild --clean

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Project	Deployment	Preview	Comments	Updated (UTC)
react-native-app-auth	Ready	Preview	Comment	Aug 22, 2025 3:14pm

[Off2Race]

Hi, @zibs – Not sure what else you want/need with regard to testing and documentation for this. Do you want me to add something to the README which explains how to configure the plugin (similar to the notes above)? Let me know and I'll be happy to do whatever you need.

[zibs]

Thanks so much @Off2Race -- I'll take a look and be sure to let you know!

[zibs]

Thanks @Off2Race -- I've updated the code to use TypeScript and added an example app that supports this flow, as well as added the docs. Feel free to take a look and a double check that it looks okay, and if so, we can look towards merging and releasing!! Really appreciate everything you've done here.

[Off2Race]

Awesome, @zibs! I'll look at it today. I should have realized that you'd want it in Typescript. My bad. Thanks for updating it. Back soon with feedback.